## Course of theoretical physics: Electrodynemics of continuous media |

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Page 63

In a body of uniform composition, on the other hand, s is a function only of p and

T, and

15.12) becomes a E2 a r= —

...

In a body of uniform composition, on the other hand, s is a function only of p and

T, and

**grad**s can be written as**grads**= (8.2/6T)',**grad**T+ (fie/5p),**grad**p. Then (15.12) becomes a E2 a r= —

**grad**P0(p,T)+Lgrad|:E2(a—E) J-8-(g)**grad**r. (15.15)...

Page 66

In a virtual translation of the body over an infinitesimal distance u, the total free

energy of the body varies, according to (11.3), by 6.9" = —_lP-Mid V, where 6G =

(§(r+u) — (€(r) = (u-

.

In a virtual translation of the body over an infinitesimal distance u, the total free

energy of the body varies, according to (11.3), by 6.9" = —_lP-Mid V, where 6G =

(§(r+u) — (€(r) = (u-

**grad**)€ is the change in the field at any given point in the body.

Page 99

The existence of such terms would, in fact, contradict the law of the increase of

entropy: the integrand in (26.5) would then contain terms in the productsj -

and

...

The existence of such terms would, in fact, contradict the law of the increase of

entropy: the integrand in (26.5) would then contain terms in the productsj -

**grad**pand

**grad**T-**grad**p, which could be of either sign, and so the integral could not be...

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angle anisotropy anisotropy energy antiferromagnetic atoms axes axis body boundary conditions calculation charge circuit coefﬁcient coefficients components conductor constant coordinates corresponding cross-section crystal Curie point curl H deﬁned deﬁnition denote dependence derivatives determined dielectric diffraction direction discontinuity dissipation domains electric ﬁeld electromagnetic ﬁeld electrons ellipsoid energy ﬂux expression external ﬁeld external magnetic ﬁeld ferroelectric ferromagnet ﬁeld H ﬁnd ﬁnite ﬁrst ﬁrst term ﬂow ﬂuctuations ﬂuid formula free energy frequency function given gives grad Hence incident induction inﬁnite integral isotropic Landau theory layer linear magnetic ﬁeld magnetohydrodynamics magnetostriction magnitude medium normal obtain optical particle permittivity perpendicular perturbation phase plane polarization PROBLEM propagated properties pyroelectric quantities reﬂection refraction relation respect result rotation satisﬁed scattering shock wave signiﬁcance solution sphere superconducting surface symmetry tangential temperature tensor theory thermodynamic potential transition uniaxial upper half-plane values variable velocity volume wave vector z-axis zero